<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        html, body {
            margin: 0;
            height: 100%;
        }

        canvas {
            display: block;
        }

    </style>
</head>
<body onload="draw();">

</body>
<script src="http://www.yanhuangxueyuan.com/versions/threejsR92/build/three.js"></script>
<script src="js/libs/stats.min.js"></script>
<script src="js/libs/dat.gui.min.js"></script>

<script src="js/controls/FlyControls.js"></script>

<script>
    var renderer;
    function initRender() {

        renderer = new THREE.WebGLRenderer({antialias: true});
        renderer.setSize(window.innerWidth, window.innerHeight);
        //告诉渲染器需要阴影效果
        renderer.shadowMap.enabled = true;
        renderer.shadowMap.type = THREE.PCFSoftShadowMap; // 默认的是，没有设置的这个清晰 THREE.PCFShadowMap
        renderer.gammaInput = true;
        renderer.gammaOutput = true;
        document.body.appendChild(renderer.domElement);
    }

    var camera;
    function initCamera() {
        camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
        camera.position.set(20, 40, 0);

        camera.lookAt(new THREE.Vector3(0,0,0));
    }

    var scene;
    function initScene() {
        scene = new THREE.Scene();
    }

    var ambientLight,pointLight;
    function initLight() {
        ambientLight = new THREE.AmbientLight("#111111");
        scene.add(ambientLight);

        pointLight = new THREE.PointLight("#ffffff");
        pointLight.position.set(-40, 60, -10);

        //告诉平行光需要开启阴影投射
        pointLight.castShadow = true;

        scene.add(pointLight);
    }


    var cube,plane;
    function initModel() {

        //辅助工具
        var helper = new THREE.AxisHelper(10);
        scene.add(helper);

        //球体
        var sphereGeometry = new THREE.SphereGeometry(10,30,30);
        var sphereMaterial = new THREE.MeshStandardMaterial({color:0xff00ff});
        var sphere = new THREE.Mesh(sphereGeometry,sphereMaterial);
        sphere.position.set(-20,20,0);

        sphere.castShadow = true;

        scene.add(sphere);

        //立方体
        var cubeGeometry = new THREE.CubeGeometry(10,10,10);

        var cubeMaterial = new THREE.MeshLambertMaterial({color: 0x00ffff});

        cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
        cube.position.x = 30;
        cube.position.y = 5;
        cube.position.z = -5;

        //告诉立方体需要投射阴影
        cube.castShadow = true;

        scene.add(cube);

        //底部平面
        var planeGeometry = new THREE.PlaneGeometry(5000, 5000, 20, 20);
        var planeMaterial = new THREE.MeshStandardMaterial({color: 0xaaaaaa});

        plane = new THREE.Mesh(planeGeometry, planeMaterial);
        plane.rotation.x = -0.5 * Math.PI;
        plane.position.y = -0;

        //告诉底部平面需要接收阴影
        plane.receiveShadow = true;

        scene.add(plane);

    }

    //初始化性能插件
    var stats;
    function initStats() {
        stats = new Stats();
        document.body.appendChild(stats.dom);
    }

    //用户交互插件 鼠标左键按住旋转，右键按住平移，滚轮缩放
    var controls,clock;
    function initControls() {

        clock = new THREE.Clock();

        controls = new THREE.FlyControls( camera );

        controls.movementSpeed = 100; //设置移动的速度
        controls.rollSpeed = Math.PI / 6; //设置旋转速度
        controls.autoForward = false;
        controls.dragToLook = false;
    }


    //初始化dat.GUI简化试验流程
    var param;
    function initGui() {

    }

    function render() {
        renderer.render(scene, camera);
    }

    //窗口变动触发的函数
    function onWindowResize() {

        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        render();
        renderer.setSize(window.innerWidth, window.innerHeight);

    }

    function animate() {

        var delta = clock.getDelta();

        //更新控制器
        render();

        //更新性能插件
        stats.update();

        controls.update(delta);

        requestAnimationFrame(animate);
    }

    function draw() {
        initRender();
        initScene();
        initCamera();
        initLight();
        initModel();
        initControls();
        initStats();
        initGui();

        animate();
        window.onresize = onWindowResize;
    }
</script>
</html>